package com.example.skycodes.servlet;

import com.example.skycodes.bean.NewsBean;
import com.example.skycodes.dao.NewsDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet(value = "/news.jsp")
public class NewsServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        String p = req.getParameter("page");//获取用户传递来的页码
        int page = 1;
        if (p != null&& p.equals("")) {
            page = Integer.parseInt(p) ;//字符串转整数
        }
        // 获取新闻信息
        NewsDao newsDao = new NewsDao();
        List<NewsBean> news = newsDao.getList(page);
        //给用户总条数和当前页数 总页数 上一页 下一页
        int totalCount,curPage,totalPage,upPage,downPage;
        totalCount = newsDao.count();//总条数
        curPage = page;//用户传递进来的页码
        if (totalCount%10==0){
            totalPage = totalCount/10;
        }else {
            totalPage = totalCount/10+1;//计算总页数
        }///
        //上一页 当前页数减去1
        if (curPage==1){
            upPage=1;
        }else {
            upPage = curPage-1;
        }
        if (curPage==totalPage){
            downPage=totalPage;
        }else {
            downPage=curPage+1;
        }
        req.setAttribute("totalCount",totalCount);
        req.setAttribute("curPage",curPage);
        req.setAttribute("totalPage",totalPage);
        req.setAttribute("upPage",upPage);
        req.setAttribute("downPage",downPage);
        // 传递新闻信息给前端页面
        req.setAttribute("news", news);
        // 加载显示前端页面
        req.getRequestDispatcher("WEB-INF/news.jsp").forward(req, resp);

    }
}
